GeneXpert Test for Quick TB Diagnosis
Discover how the GeneXpert test offers a rapid and accurate diagnosis of tuberculosis. Learn about its procedure, benefits, and role in detecting drug-resistant TB strains quickly and effectively.
Written by Dr. Mohammed Kamran
Reviewed by Dr. Dhankecha Mayank Dineshbhai MBBS
Last updated on 16th Oct, 2025
Tuberculosis (TB) is a serious but treatable infection caused by bacteria, primarily affecting the lungs. Early and accurate diagnosis is crucial to prevent complications and stop the spread of the disease. The GeneXpert test is a modern, fast, and reliable way to detect TB, especially drug-resistant forms.
In this article, we’ll explain what the GeneXpert test is, how it works, and why it’s beneficial for TB diagnosis.
What is the GeneXpert Test?
The GeneXpert test (also called Xpert MTB/RIF) is a fully automated, molecular diagnostic test that detects TB bacteria (Mycobacterium tuberculosis) in a patient’s sputum (mucus coughed up from the lungs). Unlike traditional TB tests, which can take weeks, GeneXpert provides results in just 2 hours.
Key Features of the GeneXpert Test:
- Fast results (within 2 hours).
- Highly accurate in detecting TB.
- Identifies drug-resistant TB (resistance to Rifampicin, a key TB drug).
- Simple procedure – only a small sputum sample is needed.
- Automated system – reduces human error.
Why is the GeneXpert Test Important?
TB is a major health concern, especially in countries like India. Early diagnosis helps in:
- Starting treatment quickly.
- Preventing the spread of TB to others.
- Identifying drug-resistant TB early, so the right medicines can be given.
Traditional TB tests (like sputum microscopy) take longer and may miss some cases. The GeneXpert test is more sensitive, meaning it can detect TB even when the bacteria levels are low.
Consult Top Specialists
Who Should Get Tested?
You may need a GeneXpert test if you have:
- A persistent cough (lasting more than 2 weeks).
- Fever, night sweats, or unexplained weight loss.
- Been in close contact with a TB patient.
- HIV or a weakened immune system (higher risk of TB).
- Symptoms of drug-resistant TB (if previous TB treatment failed).
If you suspect TB, consult a doctor who may recommend this test.
How is the GeneXpert Test Done?
The test is simple and painless:
1. Sample Collection: You will be asked to cough up sputum into a sterile container.
2. Lab Processing: The sample is placed in the GeneXpert machine, which extracts and analyses DNA from the bacteria.
3. Result: The machine detects TB and checks for Rifampicin resistance. Results are ready in 2 hours.
No fasting or special preparation is needed.
Benefits of GeneXpert Over Traditional TB Tests
What Happens After a Positive Result?
If the GeneXpert test confirms TB:
- Your doctor will start anti-TB medications immediately.
- If drug-resistant TB is detected, specialised treatment will be given.
- Family members or close contacts may also need testing.
Remember: TB is curable with proper treatment. Completing the full course of medicines is essential to prevent relapse.
Lifestyle Tips for TB Patients
While on TB treatment, follow these tips for faster recovery:
- Take medicines on time: Never skip doses.
- Eat a nutritious diet: Include proteins, vitamins, and minerals.
- Avoid smoking and alcohol: They weaken the immune system.
- Cover your mouth when coughing: Prevent spreading TB to others.
- Get enough rest: Helps the body fight infection.
How to Book a GeneXpert Test?
If you or a loved one has TB symptoms, getting tested early can save lives. Apollo 24|7 offers quick and reliable GeneXpert testing with fast results.
Early detection means faster treatment and better recovery!
Conclusion
The GeneXpert test is a breakthrough in TB diagnosis, providing fast, accurate, and reliable results. If you have symptoms like a long-lasting cough, fever, or unexplained weight loss, consult a doctor and consider this test.
TB is treatable – the sooner you detect it, the better the outcome!
Consult Top Specialists
Consult Top Specialists
Dr Vinay Kumar A V
Nephrologist
8 Years • MBBS, MD - General Medicine, DM - Nephrology
Bilaspur
Apollo Hospitals Seepat Road, Bilaspur
Dr. Shakti
General Physician/ Internal Medicine Specialist
25 Years • MBBS, DNB, PGDHIVM, MRCP (UK)
Delhi
Apollo Hospitals Indraprastha, Delhi
(250+ Patients)
Dr. Sandhya Chandel
General Physician/ Internal Medicine Specialist
16 Years • MBBS, MD (Int. Med.), IDCCM
Bilaspur
Apollo Hospitals Seepat Road, Bilaspur
(125+ Patients)
Dr. Hariprasath J
General Physician/ Internal Medicine Specialist
19 Years • MD (Gen Med), FCCP, Dip (Diabetology, UK)
Chennai
Apollo First Med Hospitals P H Road, Chennai
(200+ Patients)
Dr. Kiran Macha
General Physician/ Internal Medicine Specialist
21 Years • MBBS,MD General Medicine
HYDERABAD
Sri Clinic, HYDERABAD
(100+ Patients)
